Create design patterns presentation;
Atualização a partir do branch slides

- Merge branch 'slides' into feevale-tec-avancadas
Merge branch 'slides' into feevale-tec-avancadas
(wip) Slides for dependency injection pattern
Finish Dependency Injection slides;
Add design patterns to menu
Implementacao Adapter Pattern

Inclusao das paginas referentes ao pattern Adapter.
Inclusao do Observer

Inclusao do Pattern Observer.
Ajuste ortgrafia

Ajuste ortográfico num slide do Observer
Add observer references